Schedule II Valuation and Qualifying Accounts and Reserves (Details) - Schedule of valuation and qualifying accounts and reserves (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2013		May 31, 2012		May 31, 2011
Allowance for Doubtful Accounts [Member]
Schedule II Valuation and Qualifying Accounts and Reserves (Details) - Schedule of valuation and qualifying accounts and reserves [Line Items]
Balance at Beginning of Year	$ 25.9		$ 22.3		$ 18.5
Expensed	6.8		12.3		13.6
Write-Offs and Other	13.4		8.7		9.8
Balance at End of Year	19.3		25.9		22.3
Reserve For Return [Member]
Schedule II Valuation and Qualifying Accounts and Reserves (Details) - Schedule of valuation and qualifying accounts and reserves [Line Items]
Balance at Beginning of Year	57.5		33.0		30.9
Expensed	50.2		81.8		69.6
Write-Offs and Other	81.3	[1]	57.3	[1]	67.5	[1]
Balance at End of Year	26.4		57.5		33.0
Reserves For Obsolescence [Member]
Schedule II Valuation and Qualifying Accounts and Reserves (Details) - Schedule of valuation and qualifying accounts and reserves [Line Items]
Balance at Beginning of Year	90.8		82.2		78.1
Expensed	27.2		48.1		27.3
Write-Offs and Other	27.7		39.5		23.2
Balance at End of Year	90.3		90.8		82.2
Reserve For Royalty Advances [Member]
Schedule II Valuation and Qualifying Accounts and Reserves (Details) - Schedule of valuation and qualifying accounts and reserves [Line Items]
Balance at Beginning of Year	77.8		71.8		68.9
Expensed	4.7		6.5		4.5
Write-Offs and Other	1.0		0.5		1.6
Balance at End of Year	$ 81.5		$ 77.8		$ 71.8

[1] Represents actual returns charged to the reserve